"tough tushie" meaning in English

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  "lang_code": "en",
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          "ref": "2020, Kelly Turner, Sitting is Killing You So Get Off Your Butt Diets in Review:",
          "text": "I’m climbing stairs! you may say, or “I got to the gym everyday!”^([sic]) Tough tushie. Even if you work out every day, the deterioration begins the second you sit down.",
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      "glosses": [
        "get over it; grow up"
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          "get over it",
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          "grow up",
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        "(colloquial, slang, chiefly US) get over it; grow up"
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          "word": "tough tooshie"
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  "word": "tough tushie"
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        "get over it; grow up"
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        "(colloquial, slang, chiefly US) get over it; grow up"
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  "word": "tough tushie"
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